import Fastify, { FastifyInstance } from 'fastify';
import { AppError } from '../../src/utils/errors.js';
import { authRoutes } from '../../src/routes/auth.js';
import type { MockDb } from '../test-utils.js';
import { createMockDb } from '../test-utils.js';

/**
 * Build a minimal Fastify app for auth route integration tests.
 * Uses mock db and rate limit options (no actual rate limiting).
 */
export async function buildAuthTestApp(mockDb?: MockDb): Promise<FastifyInstance> {
  const db = mockDb ?? createMockDb();

  const app = Fastify({
    logger: false,
    requestIdHeader: 'x-request-id',
    requestIdLogLabel: 'requestId',
  });

  app.setErrorHandler((err: unknown, request, reply) => {
    const error = err as Error & { statusCode?: number; validation?: unknown };
    if (err instanceof AppError) {
      return reply.status(err.statusCode).send(err.toJSON());
    }
    if (error.validation) {
      return reply.status(422).send({
        error: { code: 'VALIDATION_ERROR', message: 'Validation failed', details: error.validation },
      });
    }
    return reply.status(500).send({ error: { code: 'INTERNAL_ERROR', message: error.message } });
  });

  app.decorate('db', db);
  app.decorate('rateLimitOptions', {
    login: { max: 100, timeWindow: '1 minute' },
    register: { max: 100, timeWindow: '1 hour' },
    forgotPassword: { max: 100, timeWindow: '1 hour' },
    verifyEmail: { max: 100, timeWindow: '15 minutes' },
    apiAuthed: { max: 100, timeWindow: '1 minute' },
    apiGuest: { max: 100, timeWindow: '1 minute' },
  });

  await app.register(authRoutes, { prefix: '/auth' });

  return app;
}